Document Type and Number:
Japanese Patent JPS5255983
Kind Code:
Y1
Application Number:
JP12561170U
Publication Date:
December 17, 1977
Filing Date:
December 15, 1970
Export Citation:
International Classes:
H01J40/02; H01J43/08; H01J43/28; (IPC1-7): H01J43/28; H01J39/06; H01J43/08